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MayW

We need a soundproof exterior (entry door to the house) door. My current door is single, solid wood, with two small glasses. Our house is right next to a very busy 6 lane streets (most ppl drive 40-55 mpg).1. What kind of material is more soundproof? Wood? Fiberglass with polyurethane core? Steel?2. Which thickness should I choose? A contractor told me regular door is 1.75" and he can special order for 2.25".3. Is there a particular brand/line that you recommend? 4. I read that I can add more weatherstripping. What else should I do?